THE ANIMAL AS MACHINE 35 



nor in the same physical state. There will, therefore, arise differ- 

 ences in surface tension and may be differences in osmotic pressure. 

 It will, therefore, be profitable for us to examine the energetics 

 of simple solutions ; then of colloid complexes ; and finally to 

 apply any relevant knowledge so gained to ascertained facts 

 regarding cell behaviour. 



We must not forget that our aim in this digression (to solution- 

 dynamics) is to elucidate the processes by which the potential 

 energy of foods is rendered kinetic. 



